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NS3913G1 – SYN-TECH Ester Clay Thickened Aviation Grease
Available now through the AirParts Aero marketplace.
Overview Section
The SYN-TECH NS3913G1 is a high-performance, Ester-based grease thickened with a specialized Bentone (Clay) agent. Engineered specifically for aerospace and industrial applications requiring extreme load-carrying capabilities, this grease is designed to maintain its consistency in the presence of wide temperature fluctuations and high-pressure environments.
The use of a clay thickener makes NS3913G1 a "non-melt" grease, meaning it does not have a conventional dropping point. This makes it an ideal choice for high-heat areas like aircraft braking systems, landing gear actuators, and engine control linkages where traditional soap-based greases might liquify and run out of the bearing or assembly.
Key Features Section
Non-Melt Clay (Bentone) Base: Unlike lithium or complex-soap greases, the clay thickener ensures the lubricant remains stable and in-place at temperatures exceeding $400^{\circ}\text{F}$.
Synthetic Ester Base Oil: Provides excellent lubricity and film strength, significantly reducing friction and wear in high-load metal-to-metal contact.
Extreme Pressure (EP) Additives: Formulated with advanced anti-wear agents to prevent galling and seizing in heavy-duty gear sets and threaded actuators.
Water Washout Resistance: Highly resistant to moisture and environmental contaminants, protecting critical components from corrosion even in harsh runway conditions.
Wide Temperature Range: Optimized for consistent performance from cryogenic-like high-altitude temperatures up to intense operational heat.
Chemical Stability: Resists oxidation and thickening over time, ensuring long-service intervals for sealed components.
Technical Specifications Section
| Specification | Detail |
| Part Number | NS3913G1 |
| Manufacturer | SYN-TECH Lubricants |
| Base Oil | Synthetic Ester |
| Thickener Type | Bentone (Organophilic Clay) |
| NLGI Grade | Typically Grade 1 or 2 (Consult TDS) |
| Color | Varies (Typically Amber to Tan) |
| Dropping Point | None (Non-Melt) |
| Operating Temp | $-65^{\circ}\text{F}$ to $+400^{\circ}\text{F}+$ (Approximate) |
Aircraft Compatibility Section
NS3913G1 is utilized across various airframes for specialized high-load applications:
Landing Gear Assemblies: Used for lubricating trunnion pins, bushings, and shimmy dampers where high-impact loads occur.
Brake Components: Ideal for anchor pins and torque plate slides that are exposed to high thermal energy during landing rollout.
Actuation Systems: Found in flap tracks, screw jacks, and horizontal stabilizer trim actuators.
Engine Controls: Suitable for throttle linkages and cowl flap hinges located in high-heat zones near the exhaust manifold.
Helicopter Systems: Often applied to rotor head components and tail rotor drive shaft bearings.
Technical Applications & Safety
The non-melt nature of NS3913G1 is its primary safety feature. In high-heat environments, "runny" grease can migrate onto brake discs or tires, creating a fire hazard or loss of braking performance.
Safety Warning: Do not mix clay-based grease with soap-based grease. Mixing Bentone-thickened grease (like NS3913G1) with Lithium or Polyurea greases will result in a chemical incompatibility that causes the thickener to collapse. This results in "oil separation," leaving the bearing dry and prone to catastrophic failure. Always perform a thorough purge of old grease before applying NS3913G1.
Technical Engineering Insight
The engineering value of NS3913G1 lies in its Shear Stability and Thixotropic Properties. Under the high-shear forces of a moving gear or bearing, many greases lose their viscosity and "thin out." The clay platelets in the Bentone thickener act as a structural lattice that holds the Ester oil in place. When the component stops moving, the grease "re-gels" instantly. This is critical for low-cycle, high-load aviation components like landing gear doors, where the grease must remain static for long durations at altitude without drying out, yet provide immediate, fluid-like lubrication the moment the actuator is energized.
Installation & Maintenance Addendum
Component Cleaning: Before application, clean the part with a residue-free solvent to ensure no traces of previous soap-based lubricants remain.
Application Method: Use a clean grease gun or brush. Ensure all voids in the bearing or bushing are filled, but avoid "over-greasing" sealed units, which can lead to seal rupture under thermal expansion.
Visual Inspection: During regular inspections, check for "bleeding" (oil separation). While a tiny amount of oil separation is normal for clay greases, excessive pooling indicates the grease has been contaminated or exceeded its service temperature.
